초소형 중계기용 듀얼 밴드 주파수합성기 개발에 관한 연구

나영수(Young-Soo Na),김진섭(Jin-Sup Kim),강용철(Yong-Chul Kang),변상기(Sang-Gi Byeon),나극환(Kuk-Hwan Rha) 대한전자공학회 2003 대한전자공학회 학술대회 Vol.2003 No.11

초등학교 학교폭력 예방을 위한 태권도 지도자 인식

나영수(Na, Young-Soo),김하영(Kim, Ha-Young) 한국체육과학회 2023 한국체육과학회지 Vol.32 No.6

It may well be inferred that Taekwondo instructors’ roles would have some positive effects on the reduction of the elementary school bullying. The purpose of this study was to examine the effects of the Taekwondo education on the reduction of the elementary school bullying. To this end, the researcher interviewed Taekwondo instructors about their social positions and Taekwondo education conditions to analyze the effects of Taekwondo education on the reduction of the bullying at the elementary school. For this study, the researcher sampled those masters and instructors working for 5 Taekwondo dojangs in Namyangju. Based on the results of the preceding studies, the researcher presented the questions about the positive effects of Taekwondo education on and its contribution to the reduction of the elementary school bullying. The results of this study can be summed up as follows. First, the positive effects of Taekwondo education were enhancement of self-confidence, improvement of social skills and etiquettes and enhancement of the cheerful character. Nevertheless, some children were found to practice Taekwondo more to be good-mannered and social. Secondly, it was found that if the children should practice Taekwondo for a longer time, they would be less likely to be victims of a group bullying. Lastly, it was required of Taekwondo instructors to take into consideration the possibility that the elementary children practicing Taekwondo might be more violent or less uncompromising.

연쇄붕괴 저항성능 해석을 위한 부분골조 모델

나영수(Na, Young-Soo),노삼영(Noh, Sam-Young),이업(Li, Ye) 대한건축학회 2021 대한건축학회논문집 Vol.37 No.9

For the analysis of the progressive collapse resistance performance of a structure, it is recommended to use a 3-D structure model that considers the 3-D effect of the slab, the continuity of the adjacent spans, and the redistribution of stress through the alternated path of the upper stories. Although a structure is modeled with reduced modeling concepts, the large size of the target structure still requires a lot of time on modeling and analysis. In this study, the sub-assemblage structure modeling concept was presented. The area of the sub-assemblage structure was determined by the analysis of the number of affected spans using the stress variation in the members before and after the sudden column removal in the entire structure model. The modeling concept was suggested in three levels according to the degree of the modelled detail of members located in the outer area of the sub-assemblage structure. They are evaluated by comparing the load-displacement relationship, girder stresses and plastic hinging locations with those resulted by the simulation of entire structure model.

전기화학 계면반응에 기초한 DSA 전극을 사용한 고성능 폐수처리 시스템

나영수 ( Young Soo Na ),이만성 ( Man Sung Lee ),김경호 ( Kyoungho Kim ) 한국접착및계면학회 2018 접착 및 계면 Vol.19 No.3

도시의 산업화와 인구의 빠른 증가로 인해, 지구상에서 여전히 7억 8천만명이 물자원 사용에 어려움을 격고 있으며, 이에 따라 깨끗하고 저렴한 물자원 확보 방안에 대한 관심이 집중되고 있다. 그러나, 현존하는 폐수처리 시스템은 낮은 공정효율, 높은 운영비용, 그리고 넓은 부지 요구 등의 다양한 이슈에 직면하여 있는 실정이다. 따라서, 저렴하고 효율적인 폐수 처리 시스템의 개발이 시급히 요구된다. 이러한 노력의 일환으로 rutile type RuO₂를 기반으로 한 DSA전극을 이용한 전기 화학적 방법에 기초한 폐수 처리 시스템을 제안하였고, 이를 성공적으로 시연하였다. 우리의 폐수 처리 시스템은 생활폐수의 경우, 생화학적 산소 요구량 (BOD), 화학적 산소 요구량 (COD) 및 총 유기탄소 (TOC) 제거 효율이 52.0 %, 77.8 % 및 65.6 % 로 우수한 특성을 보였다. 또한 축산 폐수의 경우, BOD, COD, 총 질소(TN), 총 인 (TP)의 제거 효율이 각각 92.9 %, 75.6 %, 35.1 %, 100 %로 획기적인 감축 효과를 거두었습니다. 이 장치의 탁월한 제거 효율과 작은 크기를 고려할 때, rutile RuO2로 코팅된 DSA를 사용한 전기화학적 폐수 처리는 생활 및 축산 폐수의 처리를 위한 유망한 방안이 될 수 있음을 제안하고자 합니다. With the rapidly growing of the population and industrization of cities, the clean and affordable water resources have gained immense interest because of remaining about 780 million people still lack access to it. However, present wastewater treatment systems have been faced with various issues, such as low processing efficiency, high operational costs and the requirement of a large area for manufacturing. It is therefore urgently required to develop an inexpensive and efficient wastewater treatment system. As the one of these efforts, we suggested and successfully demonstrated the wastewater treatment system using and electrochemical method via a dimensionally stable anode (DSA) based on rutile type RuO₂. Our system achieved biochemical oxygen demand (BOD), chemical oxygen demand (COD), and total organic carbon (TOC) removal efficiently at the respective rates of 52.0%, 77.8%, and 65.6% from household wastewater. In addition, we were able to remove BOD, COD, total nitrogen (TN), and total phosphorus (TP) from animal husbandry wastewater at rates of 92.9%, 75.6%, 35.1%, and 100%, respectively, thereby achieving dramatic reductions. Considering the excellent removal efficiency and the small size of this device, electrochemical wastewater treatment using a DSA coated in rutile RuO2 presents a promising option for the treatment of both household and animal husbandry wastewater.

연쇄붕괴 저항성능 해석을 위한 부분골조 모델링

나영수(Na, Young-Soo),노삼영(Noh, Sam-Young) 대한건축학회 2020 대한건축학회 학술발표대회 논문집 Vol.40 No.2

For the Analysis of the progressive collapse resistance performance of a structure mode It is recommended to use 3-D structure model, considering the 3-D effect of the slab, the continuity of the adjacent span, and the redistribution of stress through the alternated path of the upper level. Although 3-D structure is applied with 1-D members and joints, 2-D slab models to reduce analysis time and amount of data, the large size of the target structure still requires a lot of modeling time and analysis time. Thus, in this study, the sub-assemblage structure modeling method was presented in three levels considering the number of impacted span by the sudden column removal and the bending rigidity of the columns to located out of the sub assemblage structure model.

생물막 형성과 성장에 미치는 Sphaerotilus natans 의 영향

박영식(Young Seek Park),구기우(Ki Woo Koo),이석렬(Suk Ryoul Lee),나영수(Young Soo Na),서정호(Jung Ho Suh),송승구(Seung Koo Song) 大韓環境工學會 1997 대한환경공학회지 Vol.19 No.10

적외선 센서를 이용한 활성슬러지 계측시스템 개발

이영진(Lee Young Jin),왕보권(Wang Bo Kwon),나영수(Na Young Soo),이만형(Lee Man Hyung),송승구(Song Seung Koo),배종일(Bae Jong Il) 한국정밀공학회 1999 한국정밀공학회 학술발표대회 논문집 Vol.1999 No.5월

유증기를 구성하는 주요 10종류 성분의 온도에 따른 흡·탈착특성 비교

이송우 ( Song Woo Lee ),나영수 ( Young Soo Na ),이민규 ( Min Gyu Lee ) 한국환경과학회 2014 한국환경과학회지 Vol.23 No.9

Adsorption and desorption characteristics of the representative 10 kinds components consisting of gasoline vapor on activated carbon were investigated at the temperature range of -30℃∼25℃. The breakthrough curves of each vapors obtained by the Thomas model were well described the breakthrough experimental results of this study. The breakthrough times of each vapors were correlated with the molecular weight, density, and vapor pressure. The breakthrough times had greater correlation with boiling point than molecular weight and density. The slope of the breakthrough curve was a proportional relationship with the rate constant (k) of Thomas model expression. The higher the slope of the breakthrough curve, the rate constant was larger. The biggest slope vapor had the smallest adsorption capacity (qe). Adsorption and desorption characteristics of mixed vapor similar to the gasoline vapor were studied at room temperature (25℃). The mixed vapor consisting of 9 components; group A (pentane, hexene, hexane), group B (benzene, toluene), group C (octane, ethylbenzene, xylene, nonane) was examined. Group A was not nearly adsorbed because of substitution by group C, and the desorption capacity of group A was smaller than group C. The adsorbed substances were confirmed to be Group C.

Zeolite의 수증기 흡착특성

이송우 ( Song Woo Lee ),나영수 ( Young Soo Na ),안창덕 ( Chang Doeuk An ),이민규 ( Min Gyu Lee ) 한국환경과학회 2011 한국환경과학회지 Vol.20 No.5

The purpose of this work is to present the experiment results by a dynamic adsorption of water vapor on pelletized zeolites (ADZ300, ADZ400, and ADZ500) in fixed bed. The breakthrough curves of water vapor with several different concentrations and temperature in the range of 25~45℃ on zeolite bed were investigated. In the same conditions, the breakthrough time on ADZ400 and ADZ500 were little longer than ADZ300, and the equilibrium adsorption capacity on ADZ500 was highest. The higher the concentration of water vapor was, the faster the breakthrough time was, and the slope of breakthrough curves showed a tendency to increase. The faster the flow rate of water vapor was, the faster the breakthrough time was relatively, but variations between flow rate and breakthrough time did not have a proportional relationship. The breakthrough curve maintained constant gradient in spite of variation of flow rate in the same concentration. The temperature rise in zeolite bed by adsorption heat was occurred in the early stage of adsorption. After water molecule layers were formed on the surface of zeolite, the temperature was slowly cooled by water vapors continuously flowed in as constant temperature. The greater the concentration of water vapor and adsorption temperature were, the temperature difference in zeolite bed was increased.

제올라이트 13X와 실리카-알루미나의 흡착특성 비교

이송우 ( Song Woo Lee ),나영수 ( Young Soo Na ),안창덕 ( Chang Doeuk An ),이민규 ( Min Gyu Lee ) 한국환경과학회 2011 한국환경과학회지 Vol.20 No.6

This work is to compare the experiment results by a continuous fixed-bed adsorption of water vapor, acetone vapor, and toluene vapor on zeolite 13X (SAU) and silica-alumina (SAK). SAU and SAK have very different pore structure but similar composition as inorganic adsorbent. The relationship between the equilibrium adsorption capacity and specific pore size range were studied. Adsorption of water vapor was more suitable on SAU than SAK because SAU has relatively more developed pores around 5 Å than SAK in the pore range of 10 ~ 100 Å. Adsorption of acetone vapor was more suitable on SAK than SAU because SAK has relatively more developed pores around 5~10 Å than SAK in the pore range of less than 10 Å. Adsorption of toluene vapor was more suitable on SAK than SAU because SAK has relatively more developed pores in the pore range of 10~100 Å than SAK. Adsorption capacity of the adsorbent was closely related to the surface area generated in the specific pore size region. But it was difficult to distinguish the relationships between adsorption capacity and micro area, and the external surface area of adsorbent.